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2012 Webinars

February 21st at 10 a.m.– Struvite as a Phosphorus Fertilizer Source for Greenhouse Crop Production

Recording now available:

Phosphorus is one of the major elements essential for plant growth. Most commercial phosphorus fertilizers are derived from phosphate rock but the world supply of mined phosphate is limited. Wastewater, biosolids, and animal manures are rich in phosphorus, which can result in local excesses of P, leading to inefficient use of resources and the potential for eutrophication of surface water. One method of P capture is through struvite production. Struvite has traditionally been a nuisance product in wastewater treatment plants, but potentially could be a P fertilizer in handy crystalline form. Struvite can also be produced from animal manures. A potential high-value use for struvite is to replace mined fertilizer P in the soilless substrates typically used to grow plants in containers in greenhouses.

The webinar will highlight recent research by Rita Hummel of WSU on struvite as a phosphorus source for greenhouse production of bedding plants and vegetable starts. Her research includes struvite derived from municipal wastewater and dairy manure. Craig Cogger will open the webinar with a brief overview of the phosphorus challenge. After Rita’s presentation of greenhouse research results, Keith Bowers will discuss struvite production as one phosphorus removal technology for wastewater at livestock, food processing, and public sewage treatment sites. The webinar will close with a brief summary by Craig and an open question period.